2. Blue thin mushrooms come from a young man in Nanning, Guangxi. After breaking up with his girlfriend, he sent a video to express his pain, but his Mandarin was not standard. When he felt uncomfortable and wanted to cry, he turned into a blue thin mushroom.
3. Putonghua is a modern standard Chinese based on northern Mandarin and with typical modern vernacular as grammatical norm. As one of the working languages of the United Nations, Mandarin has become an important bridge for cultural exchanges between China and foreign countries, and it is also the first choice for foreigners to learn Chinese.